The Transition from Heavy Fermion to Mixed Valence in Ce1-xYxAl3: A Quantitative Comparison with the Anderson Impurity Model

Authors :: Goremychkin, E. A.
Osborn, R.
Sashin, I. L.
Riseborough, P.
Rainford, B. D.
Adroja, D. T.
Lawrence, J. M.
Source :: Phys. Rev. Lett. 104, 176402 (2010)
Publication Year :: 2009
Abstract: We present a neutron scattering investigation of Ce1-xYxAl3 as a function of chemical pressure, which induces a transition from heavy-fermion behavior in CeAl3 (TK=5 K) to a mixed-valence state at x=0.5 (TK=150 K). The crossover can be modeled accurately on an absolute intensity scale by an increase in the k-f hybridization, Vkf, within the Anderson impurity model. Surprisingly, the principal effect of the increasing Vkf is not to broaden the low-energy components of the dynamic magnetic susceptibility but to transfer spectral weight to high energy.<br />Comment: 4 pages, 5 figures

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